Incandescent electric lamp.



' H. J. JAEGER. INGANDESGENT ELECTRIC LAMP.

APPLIOATIOK FILED NOV. 4, 1907.

Patented Dec. 1, 1908.

I like in any ordinary multiple are UNIT D STATES PATENT OFFICE.

' HERMAN J. JAEGER, OF NEW YORK, N. Y

INCANDESCEH'T ELECTRIG LAME.

Specification of Letters Patent.

Patented Dec. 1, 1908.

Application filed November 4, 1%7. fierial'llo. 400,435.

To all whom it may concern:

Be it known that I, HERMAN J. Janeen, a

I citizen of the United States of America, and

the filament form one continuous single conuctor requiring but twoleading-in 1wires am Such lo metallic filaments for mcandesceilltelectric amps, for instance, the so called tungsten or Wolfram filamentexpands by the heat of the electric current when the lamp is lighted.Each loop of the filament accord ingly gets longer and at the same timesoftens to a certain degree. Therefore lam s con taining such filamentscan not be urned safely except when the lamp hangs vertically downwardwith the base at the top and then there is danger of two neighboringloops coming in contact with each other whereby the filament burns outor one loop may touch the glass wallbreaking same and destroying thevacuum. In case lamps are mounted with the base at the bottom andthefilament at the to the danger of loosening the lamp is so muclicater. For certain purposes it is desira le or necessary to mount lampsso that. the filament is in a horizontal position. Lamps of the ty edescribed cannot be used at all for suc purposes. In order to render itpossible to use such lon tungsten or Wolfram filaments in lamps w ichare horizontally mounted r substantial support for the filament must beprovided within the lamp. 'lhe usual an chors heretofore employed forsupporting filaments will not answer for this purpose for economicreasons because too many of them would be necessary to support say, afour loop filament and such anchors are made of platinum wire which isvery expensive.

My novel incandescent lamp which forms the subject matter of thisinvention over- .comes the described deficiencies as will be 7 fullyexplained further down in connection with the accompanying drawing inwhich rlcigure i represents in elevation an incandescent lamp embodyingin'desirable form the present improvements. l i 2 illustrates in topplan view part of tle and the top portions of the loops of the'lilament,and big. 3 is a like view on line 3, 3 of bimilar letters of referencedenote like parts in all the figures.

The present improvements may be applied to any kind or style ofincandescent lamps. it is however preferred to embody the improvementsin the so called well known tipless lamps.

In Fig. l of the drawing a represents the lamp globe or vacuum chamberwhich neces' sarily is of elongated or pear shape, 6 is the v stemscaled into the globe in the usual man her and carrying the conductingwires 0, d,

which are sealed into the top portion of the stem. To the solid topportion of the stem is fused a post or standard e consisting preferablyof a thin glass rod; A disk of mice f is cemented to the lower portionot the standand e having a multiple of small openings of even numbernear its circumference. Alike mica disk g is cemented to the toportionof the standard c having a like multip e 'of'openings h, of even.number shown in Fig. 2 and support.

corresponding and coinciding with the opens mgs in'the mica disk). Thestandard .2 and the mica disks f and 9 form the support for the longfilament, each loop passing through two neighboring openings h. Fourloops are represented on the drawing and therefore eight openings mustbe in each mica disk. The lower ends of the filament loops '5 arecemented. in the openings of the lower disk f and the adjoining ends oftwo neighboring loops are connected by a short bridge j with theexception of one pair of such ends of two neighboring loops which passthrough the disk f and are cemented to the ends of the platinum wireswhich are bent horizontally over and again upward to meet, the ends ofthe one pair of loops as shown at In the described manner one continuouslong compound filament is formed out of the four loops and the currentpassing in through the one wire passes successively through the fourloops and returns through the second Wire. The four loops are looselypassing through the openings inthe top disk g'allo\vcome incandescent.The short bridges 9' are I made of any suitable mater al such as piecesof carboniilament of sufficiently low reslstnear the stem leaving twosuch ends free 2 sea-"roe ing thus of linear expansion when they besternand allowing of linear expansion, conducting bridges cemented each. totwo ad oining ends of two neighboring loops on the disk which passthrough said disk and connect ance or of platinum wire. The bridges y'bear one each with one of th leading-1n wires.

against the lower disk f and their ends are I practically cementedthereto in the place I where same are cemented to the loop ends as shownin hig. 3. 1 or the stem,

As above described the supporting disks f intervals to said standardhaving each a muland g are preferably made of mica. The 5 tiple of smallopenings of even number near disks are carefully freed from gases sothat i the circumference which coincide with each they do not give upenough gas during the other, andalong metallic com ound filament burningof the lamp to injure. the filament a multiple of in said openingconsisting 0 but this process does not form art of this loops cementedwith their open ends in the invention. ,Any other non con uctingmaopenings of the disk near the stem andallowterial which does not giveup gases may he 2 ing of linear expansion, conducting bridges used inplace of mica, for instance, very thin cemented each to two adjoining eds oftwo lass plates but these are not so easily hen ineighb'oring loopson the disk near the stem led and.the openings made so conveniently.leaving two such ends free which pass through Two of the described disksareshown on the i said dish and connect one each with one of drawing butthree or more may also be ens/k the leading-in wires;

' claim as new and desire to secure by Letters Patent:

- of loops in said openings cemented with their 3. in anincandeshentlsnnp of the ty pedeployed in lam s of considerable iengthsuch as the so calle glass tube lamps. i, scribed a thin. glass rod,mica disks attached The'filament loops of tungsten orlwolfram. i atsuitable intervals to said standard having supported by the describeddevices do not g each a multiple of'small openings of even sag, onlylinear expansion takes'place during number near the circumference whichcointhe burning of the lamp and the natured life side with each other,and along metallic filaof the lamp is neither unpaired nor the his meritin said openings consisting of a multiple ment injured. of loopscemented with their open ends in th Having thus openings of the disknear ,he stem and allow ing of linear expansion, ,conducting bridgescemented each to two adjoining ends of two descrihed my invention 1 llAn incandescent electric lamp comprising a vacuum chamber with stem andleading-in wires, a thin long standard fused to the top ortion of thestem, insulating disks attached leaving-two such ends free which passthrough said dish and connect one eaci with one of the leading-in wires.

Signed at New York, N. Y., this 2nd day of November, 1907.

HERMAN J. JAEGER.

at suitable intervals to said standard having each a multiple of smallopenings of even number near the circumference which coincide with c'achother, and along metallic compound filament consisting of a multipleWitnesses Lunwre Kl. Bonn, Mouse Sim/nu.

open ends in the openings of the disk near the 2. In an incandescentelectric lamp of the' neighboring loops, on the disk near the stem typedescribed a stem with leading-in wires, which are tight in the openingsof the disk f .i a thin long glass rod fused to the top portioniicadisks, attached at suitable

